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TM Fong, SA Anderson, H Yu, RR Huang and CD Strader
Department of Molecular Pharmacology and Biochemistry, Merck Sharp & Dohme Research Laboratories, Rayway, New Jersey 07065.
Two isoforms of the human neurokinin-1 receptor were cloned and characterized in heterologous expression systems of mammalian cell culture and Xenopus oocytes. The two isoforms differ only in the length of the encoded polypeptide. The peptide-binding properties of the long form of human neurokinin-1 receptor are consistent with those of the native neurokinin-1 receptor of mammalian tissues, where substance P is the most potent agonist. Peptide agonists elicit an oscillating current in Xenopus oocytes expressing the long form. In contrast, the short form of human neurokinin-1 receptor expressed in COS cells binds substance P with an apparent affinity at least 10-fold lower than that of the long form, and it elicits the electrophysiological response only weakly in Xenopus oocytes. These data suggest that the short form couples to a different effector system. Sequence analysis suggested that the two isoforms may arise from alternative pre-mRNA splicing. These results indicate that multiple forms of the human neurokinin-1 receptor exist and the differential activation of intracellular effector may be involved in generating the complex biological effects of substance P.
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